CVE-2020-37124
CRITICAL
2026-02-05
[email protected]
9.8
CVSS 3.1
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CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Lifecycle Timeline
3
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
PoC Detected
Feb 05, 2026 - 20:47 vuln.today
Public exploit code
CVE Published
Feb 05, 2026 - 17:16 nvd
CRITICAL 9.8
Tags
Description
B64dec 1.1.2 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler (SEH) with crafted input. Attackers can leverage an egg hunter technique and carefully constructed payload to inject and execute malicious code during base64 decoding process.
Analysis
Buffer overflow in B64dec 1.1.2 base64 decoder allows attackers to execute arbitrary code by overwriting structured exception handler pointers. PoC available.
Technical Context
CWE-121 stack overflow. Oversized input to the base64 decoder overwrites SEH pointers on the stack, enabling control flow hijacking.
Affected Products
['B64dec 1.1.2']
Remediation
Update to a patched version. Implement input length validation before decoding.
Priority Score
69
Low
Medium
High
Critical
KEV: 0
EPSS: +0.1
CVSS: +49
POC: +20
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External POC / Exploit Code
Leaving vuln.today
Destination URL
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